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They are not gone yet, the British Parlement still needs to vote on if they will leave or not and that is not expected until November.
It is my belief that when it comes down to it they government will vote against the referendum result and they will remain in the EU
I do not think it makes EU stronger, but some countries benefit by becoming stronger within EU and due that less likely to leave.
I don't expect any other country to leave, at least not within next 5 years or so. Unless there's a sudden surge of anti-EU popular opinion in some country like Greece, Austria or Slovenia. But it would be much harder for anyone else to leave than it was for UK, especially countries using euro.
I would bet that after UK a country joins EU - Iceland? - before any other leaves.
As for UK, I do believe it really leaves, it would be difficult to turn around now. But that's far from certain, could be second referendum, early elections or whatever. 60-40.